An Amended Nuclear Pact Holds Hope of Total Ban WILLIAM EPSTEIN and GLENN T. SEABORG, William Epstein is a senior fellow at the United Nations Institute for Training and Research; he represented the U.N. secretary-general at the negotiations leading to the 1963 test-ban treaty and the 1968 non-proliferation treaty. Glenn T. Seaborg is a professor of chemistry and the chairman of the Lawrence Hall of Science at UC Berkeley; he was the chairman of the U.S. Atomic Energy Commission from 1961 to 1971